The cstools-3.5 directory has the source code for the tools used to build
a2c, namely pg.exe, lg.exe, and Tools.dll.  These tools are derived from the
compiler tools in C# developed by Malcolm Crowe; see
<http://cis.paisley.ac.uk/crow-ci0/> for a later version of those tools. The
cstools.bat file has been modified and made into create-tools.bat, and a
Mono version of that file has been created at create-tools.sh.
